Method and apparatus for flyash bottom-feeding circulating fluidized bed for fire-resistance fuel

Abstract

The invention provides a kind of fly ash bottom feeding circular fluidized-bed combustion method and the device, the method is: uses fly ash collector to collect the fly ash with high content in smoke, the fly ash are put into the back material controller through vertical pipe, then and they are carried to the return pipe through transmitting and ejector, and they are returned to the thick phase area of bed through bottom feeding spraying muzzle which is high temperature resisting and corrosion resisting. The device is: it is made up of fly ash collector, back material controller, gas transmitting ejector and the combustion furnace. The top of the combustion furnace connects with the inlet of fly ash collector, the fly ash through the fly ash collector outlet, are carried to the thick phase area of combustion furnace through the bottom feeding sprayer with gas transmitting ejector. The invention can enhance the combustion effect of the fly ash; it can save energy and protect the environment.

Description

1. Technical field [0001] The invention relates to a combustion method and device for burning anthracite, lean coal or other difficult-to-combustible fuels, in particular to a combustion method and device for a fly ash bottom-fed circulating fluidized bed for difficult-to-combustible fuels. 2. Background technology [0002] The dominant coal resources in my country's energy structure are very rich, but low-volatile anthracite and high-ash and high-sulfur low-quality coal occupy a considerable proportion and are widely distributed. Fully and rationally utilizing this part of coal resources will have significant economic benefits and social benefits. [0003] Circulating fluidized bed combustion has outstanding advantages such as high combustion intensity, good combustion stability, and wide fuel adaptability. It can use fuels with high ash, high moisture, and low calorific value, such as: coal gangue, oil shale, and other boilers that are difficult to burn. Anthracite with a ...

AI Technical Summary

Problems solved by technology

At the same time, due to the high position of the flashback point and the "attached wall" effect, the residence time of the flashback fly ash in the high-temperature zone of the furnace is relatively short, resulting in the use of anthracite or lean coal with poor combustion activity and small-capacity fluidization with a low furnace height. The fly ash at the tail of the bed boiler has a high content of combustibles, the efficiency of the boiler is low, and a lot of energy is wasted

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